Temperature converter
Fahrenheit to Kelvin
Fahrenheit and Kelvin measure the same quantity in different unit systems. The relationship is K = (°F − 32) × 5/9 + 273.15, which gives 255.927778 K per °F. Below you can convert any value, check a worked example and read the full chart.
Formula K = (°F − 32) × 5/9 + 273.15
Need the other direction? Kelvin to Fahrenheit.
How to convert Fahrenheit to Kelvin
Fahrenheit places 32 at water's freezing point and 212 at its boiling point at sea level. Kelvin starts at absolute zero and uses the same increment as Celsius, so K = °C + 273.15.
To convert Fahrenheit to Kelvin, multiply the value in °F by 255.927778. For example, 10 °F × 255.927778 = 260.927778 K. This works because the ratio between the two units is constant for every value in temperature.
Worked examples
| °F | K |
|---|---|
| 1 °F | 255.927778 K |
| 2.5 °F | 256.761111 K |
| 5 °F | 258.15 K |
| 10 °F | 260.927778 K |
| 25 °F | 269.261111 K |
| 50 °F | 283.15 K |
| 100 °F | 310.927778 K |
Reverse conversion
| K | °F |
|---|---|
| 1 K | -457.87 °F |
| 5 K | -450.67 °F |
| 10 K | -441.67 °F |
| 25 K | -414.67 °F |
| 50 K | -369.67 °F |
| 100 K | -279.67 °F |
When this conversion is useful
This is the calculation you need when you are reading a weather forecast, an oven dial or a scientific dataset from another country. Because the factor is fixed, you can use the same number for a single measurement or for a batch: 1,000 °F is 810.927778 K.
Is the conversion exact?
The formulas are exact for the defined scales; Kelvin and Celsius differ by the fixed offset 273.15.
Reference: BIPM SI Brochure and NIST SP 811. Last reviewed: 2026-11-01.
°F to K conversion chart
The chart lists the most requested values. For a value that is not here, use the converter at the top of the page.
| Fahrenheit (°F) | Kelvin (K) |
|---|---|
| 1 °F | 255.927778 K |
| 2 °F | 256.483333 K |
| 3 °F | 257.038889 K |
| 4 °F | 257.594444 K |
| 5 °F | 258.15 K |
| 6 °F | 258.705556 K |
| 7 °F | 259.261111 K |
| 8 °F | 259.816667 K |
| 9 °F | 260.372222 K |
| 10 °F | 260.927778 K |
| 11 °F | 261.483333 K |
| 12 °F | 262.038889 K |
| 13 °F | 262.594444 K |
| 14 °F | 263.15 K |
| 15 °F | 263.705556 K |
| 16 °F | 264.261111 K |
| 17 °F | 264.816667 K |
| 18 °F | 265.372222 K |
| 19 °F | 265.927778 K |
| 20 °F | 266.483333 K |
| 21 °F | 267.038889 K |
| 22 °F | 267.594444 K |
| 23 °F | 268.15 K |
| 24 °F | 268.705556 K |
| 25 °F | 269.261111 K |
| 26 °F | 269.816667 K |
| 27 °F | 270.372222 K |
| 28 °F | 270.927778 K |
| 29 °F | 271.483333 K |
| 30 °F | 272.038889 K |
| 31 °F | 272.594444 K |
| 32 °F | 273.15 K |
| 33 °F | 273.705556 K |
| 34 °F | 274.261111 K |
| 35 °F | 274.816667 K |
| 36 °F | 275.372222 K |
| 37 °F | 275.927778 K |
| 38 °F | 276.483333 K |
| 39 °F | 277.038889 K |
| 40 °F | 277.594444 K |
| 41 °F | 278.15 K |
| 42 °F | 278.705556 K |
| 43 °F | 279.261111 K |
| 44 °F | 279.816667 K |
| 45 °F | 280.372222 K |
| 46 °F | 280.927778 K |
| 47 °F | 281.483333 K |
| 48 °F | 282.038889 K |
| 49 °F | 282.594444 K |
| 50 °F | 283.15 K |
| 60 °F | 288.705556 K |
| 70 °F | 294.261111 K |
| 80 °F | 299.816667 K |
| 90 °F | 305.372222 K |
| 100 °F | 310.927778 K |
Frequently asked questions
How many Kelvin are in 1 Fahrenheit?
1 °F equals 255.927778 K.
How do I convert Fahrenheit to Kelvin?
Multiply the °F value by 255.927778. Example: 25 °F = 269.261111 K.
What is 2.5 °F in K?
2.5 °F = 256.761111 K.
Is the °F to K conversion exact?
The formulas are exact for the defined scales; Kelvin and Celsius differ by the fixed offset 273.15.
Does the calculator work offline?
Yes. The conversion runs in your browser with JavaScript, so it works after the page has loaded, even without a connection.